Which has highest `pk_(a)` valueA. `R_(3)C-NH_(2)`B. `R_(2)NH`C. `R-NH – InterviewSolution

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1.	Which has highest `pk_(a)` valueA. `R_(3)C-NH_(2)`B. `R_(2)NH`C. `R-NH_(2)`D. `NH_(3)`.
Answer» Correct Answer - D Only `2^(@)` and `3^(@)` amines do not liberate `N_(2)` on reaction with `HNO_(2)`. All the given amines are `1^(@)` except tri-methylamine which is `3^(@)`. Thus, option (A) is correct.

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